Do you need a travel eSIM for Europe? The honest maths
By the team behind the eSIM Checker. Updated 18 August 2026.
Whether a travel eSIM is worth buying for Europe comes down to one question almost nobody asks first: what does your existing network already include? Post-Brexit, UK networks split into two camps — and the camp you're in changes the answer completely.
Camp 1: you might not need anything
O2 still includes EU roaming on most plans (fair-use capped around 25GB). giffgaff and Tesco Mobile include EU roaming within smaller fair-use caps, and several other MVNOs have kept inclusive roaming as a selling point. If you're in this camp and your trip is ordinary — maps, messages, photos, some streaming — your existing SIM does the job for free. Buying an eSIM would be spending money to solve a problem you don't have.
Camp 2: the daily-fee networks
EE, Vodafone and Three charge roaming fees on most current plans — typically £2–3 per day used. The maths is simple: a weekend in Paris costs ~£5–7 (fine, pay it), but a two-week family holiday is ~£35 per phone, and a month working remotely is £75+. That's where a travel eSIM wins: a 10–20GB Europe data pack costs roughly £10–20 once, and multi-country Europe packs cover 30–40 countries on one purchase.
The three catches
Data only. Travel eSIMs don't give you a UK number — your normal SIM stays in for calls/texts while the eSIM carries the internet. Hotspot rules. Metered eSIMs generally tether freely; "unlimited" ones often cap it (if you plan to hotspot a laptop, this matters — our checker filters for it). "Unlimited" isn't. Every unlimited plan throttles after a daily full-speed allowance, usually 1–4GB/day. For most travellers a metered pack is better value than unlimited anyway.
The two-minute decision
1) Check your network's roaming policy for your specific plan. 2) If it's included — go on holiday, you're done. 3) If you'd pay daily fees, and the trip is 5+ days: get an eSIM, sized at roughly 1–1.5GB per day of normal tourist use. Our eSIM Checker ranks current prices by destination and trip length — commission-independent, best deal first.
Roaming inclusions are plan-specific and change often — always verify with your own provider before travelling. Provider links are affiliate links; the best option always ranks first even when it pays us less, or nothing.